If my c4 transmission is a manual, as in used to be a 3 on the tree. Does this mean that it has a manual valve body?
Nope. Manual valve bodies are like a manual transmission without the clutch. The trans will only run in the gear selected. It no longer shifts automatically.
For extra info, there was a C4S option transmission one year 1970 that had a manuel valve body from the factory that had to be shifted manually. These units had no vacuum controlled modulator, internal govenor or kickdown linkage.